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    <script>
        /* 
            =可以将符号右侧的值赋值给符号左侧的变量
            +=
            -=
            *=
            /=
            %=  a%=5  等价于a=a%5

         */
         var a=10;
         //a=a+5;
         a+=5;
         a%=5;
         console.log("a="+a);
    </script>
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